Delta Industrial 23-710

The Delta Industrial Sharpening Center Model 23-710 is a versatile power tool designed for sharpening various woodworking tools. It features a 1/5 HP motor and comes equipped with both a dry and a wet grinding wheel, allowing for both rough grinding and fine sharpening.

Function Description:

The Sharpening Center is primarily used for sharpening wood chisels, plane irons, some lathe turning tools, jointer knives, and planer knives. It offers a dual-wheel system: a 5-inch diameter, 120-grit aluminum oxide dry wheel for initial rough grinding and an 8-inch diameter, 1000-grit wet wheel for fine sharpening. The wet wheel system includes a water tank with an adjustable spigot to direct water onto the grinding wheel, ensuring a cool grinding process and preventing overheating of the tool's edge. A drain is provided underneath the wet grinding wheel housing to dispose of water.

The device includes a tool and chisel holder, which is a standard accessory, designed to securely hold tools at the correct angle for sharpening. This holder can be used with both the wet and dry wheels. For specialized tasks like sharpening jointer and planer knives, an optional accessory, the 23-715 Sliding Tool Rest, is available. This sliding tool rest provides enhanced support and precision for sharpening longer blades.

Important Technical Specifications:

Motor: 1/5 HP
Dry Grinding Wheel: 5-inch diameter, 120-grit aluminum oxide
Wet Grinding Wheel: 8-inch diameter, 1000-grit
Power: 120 volts, 60 Hz alternating current
Grounding: 3-prong grounding type plug, requires a matching grounded outlet.
Extension Cord: Requires a 3-wire extension cord with a 3-prong grounding type plug and matching receptacle. The gauge of the extension cord should be appropriate for the cord length and ampere rating to prevent voltage drop and overheating. Refer to the provided charts for recommended sizes.

Usage Features:

Safety First: The manual emphasizes reading and understanding all warnings and operating instructions before use. It highlights the importance of wearing eye protection (safety glasses, face or dust mask), proper apparel (no loose clothing, gloves, neckties, rings, bracelets, or other jewelry), and protective hair covering.
Work Area: Maintain a clean and well-lit work area, free from dampness or rain to prevent electric shock. Keep children and visitors away from the machine.
Machine Condition: Ensure all tools and machines are in peak condition, sharp, and clean. Regularly check for damaged parts, alignment of moving parts, and binding.
Guards: Always use the provided guards, ensuring they are in place, secured, and working correctly.
Adjustments:
- Eyeshield: The eyeshield is adjustable and can be positioned to any desired angle for protection. It is assembled using screws, flat washers, and hex nuts, and secured with a clamp bracket and lock knob.
- Dry Wheel Tool Rest: The tool rest for the dry wheel is adjustable to position its inside edge as close as possible to the grinding wheel (1/8" or less). It can also be rotated to a desired angle. Adjustments are made by loosening and tightening a hex head screw using the supplied wrench.
- Tool and Chisel Holder Base: The mounting post of the tool and chisel holder base is inserted into a hole in the front of the machine and secured with a screw. Its position can be adjusted by loosening and tightening a screw. The height of the assembly is adjusted by loosening a screw and turning an adjustment knob.
- Tool and Chisel Holder: The holder itself can be tilted to conform to the angle of the tool being sharpened by loosening a set screw and turning a knob. It can also be moved in or out by loosening a set screw and sliding the assembly.
- Water Tank: The water tank can be rotated to direct water from its spigot onto the wet grinding wheel. The flow of water is controlled by a knob.
Starting and Stopping: The machine is turned ON/OFF via a switch located on the front of the grinder base, inside a water-resistant enclosure. Push the left side to turn ON and the right side to turn OFF.
Splash Guards: Two adjustable splash guards are provided. The front guard's top edge should be slightly below the grinding surface of the wet wheel, while the rear guard should be positioned high.
Grinding Technique:
- Dry Wheel: For tools with deep nicks, rough grinding should be performed on the dry wheel first. The tool or chisel is inserted between the clamp knobs of the holder, with its edge against the protractor gauge. The protractor gauge is adjusted to the correct angle.
- Wet Wheel: Fine sharpening is performed on the wet wheel. The tool and chisel holder assembly is placed on the tool rest base. The tool rest base is leveled with the wet grinding wheel.
- Planer/Jointer Knives (with optional sliding tool rest): Knives are carefully slid between the top and bottom pieces of the sliding tool rest, ensuring the bevel edge is down and the back of the knife sits against the adjustment bar. The knife should protrude at least 5/16" from the tool rest. The height of the tool rest base is adjusted so the knife lightly touches the grinding wheel, ensuring it is parallel to the wheel. The bevel edge of the knife should be flat on the grinding wheel, adjusted with a tilting screw if necessary.
Workpiece Handling: Always hold the workpiece firmly against the tool rest. Feed the workpiece against the direction of the rotation of the abrasive surface. Do not force the workpiece. Avoid awkward operations and hand positions. Keep arms, hands, and fingers away from the wheel.
Wheel Care: Never grind on a cold wheel; run the grinder for one minute before applying the workpiece. Do not start the machine with the workpiece against the grinding wheel. Dress the dry wheel on the face only to prevent it from becoming too thin. Never apply coolant directly to the grinding wheel as it can weaken the bonding strength. Dip the workpiece in water to cool it.

Maintenance Features:

Cleaning: Periodically blow out all air passages with dry compressed air. Clean all plastic parts with a soft damp cloth; avoid solvents.
Wheel Dressing: A stick-type dresser is supplied to dress the dry grinding wheel. This process helps keep the wheel face clean and its corners square.
Replacing Wet Grinding Wheel: Disconnect the machine from the power source. Use the supplied wrench to remove the wheel locking nut, then remove and replace the wet wheel.
Replacing Dry Grinding Wheel: Disconnect the machine from the power source. Remove three screws and the side cover. Hold the motor shaft on the inside of the grinding wheel to prevent it from turning, then remove the wheel nut (using a 13/16 wrench, not provided) and replace the dry grinding wheel.
Troubleshooting (Failure to Start): Check the cord plug for good contact in the outlet. Check for blown fuses or open circuit breakers.
Storage: The supplied wrench can be stored in a bracket on the machine when not in use.
Securing the Machine: If the machine tends to tip, slide, or "walk" during operation, it must be secured to the supporting surface using the two provided holes.